Multicomponent Covalent Chemical Patterning of Graphene

González, Miriam C. Rodríguez; Leonhardt, Alessandra; Stadler, Hartmut; Eyley, Samuel; Thielemans, Wim; Gendt, Stefan De; Mali, Kunal S.; Feyter, Steven De

doi:10.1021/acsnano.1c03373

Cited by 38 publications

(38 citation statements)

References 36 publications

(61 reference statements)

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“…[ 7,8 ] The electronic structures could be modulated by choosing n‐type or p‐type functional groups. [ 9 ] In addition, some other Janus 2D monolayers have also been extensively investigated, such as Janus graphene oxide nanosheets, [ 10 ] Janus silicene, [ 11 ] and asymmetric double‐sided bilayer WSe 2 . [ 12 ] As a representative class of 2D materials, transition metal dichalcogenide (TMD) monolayers possess intrinsic in‐plane (IP) asymmetry, and distinctive electronic and optical characteristics.…”

Section: Introductionmentioning

confidence: 99%

2D Janus Transition Metal Dichalcogenides: Properties and Applications

Tang

Kou

2022

Physica Status Solidi (b)

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The successful fabrication of Janus transition metal dichalcogenide (TMD) monolayer has sparked extensive research interests in various fields, such as nanoelectronics, optoelectronics, valleytronics, and catalysis. Janus TMDs can not only inherit the advantages of conventional TMDs but also produce novel properties which are different from their counterparts. The breaking of vertical mirror symmetry can induce a variety of novel properties, such as Rashba spin splitting, vertical piezoelectricity, and long exciton lifetime. Moreover, the intrinsic electric field that originates from the vertical asymmetry can serve as a superior platform for tuning the interlayer coupling when forming van der Waals structures. In this mini review, the recent key research progresses of 2D Janus TMDs, including the fundamental properties and potential applications, are briefly summarized, and the existing challenges are also presented.

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Section: Introductionmentioning

confidence: 99%

2D Janus Transition Metal Dichalcogenides: Properties and Applications

Tang

Kou

2022

Physica Status Solidi (b)

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“…Bypassing the ET chemistry of graphene, we recently developed a method by using reducing reagents (potassium iodide and ascorbic acid) to directly reduce diazonium salts to produce the aryl radicals for the CFG, thereby obtaining a relatively high degree of covalent functionalization. [ 39 , 40 ] While elegant, these chemical reduction‐based approaches require an additional reagent.…”

Section: Introductionmentioning

confidence: 99%

Grafting Ink for Direct Writing: Solvation Activated Covalent Functionalization of Graphene

et al. 2022

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Covalent functionalization of graphene (CFG) has shown attractive advantages in tuning the electronic, mechanical, optical, and thermal properties of graphene. However, facile, large-scale, controllable, and highly efficient CFG remains challenging and often involves highly reactive and volatile compounds, requiring complex control of the reaction conditions. Here, a diazonium-based grafting ink consisting of only two components, i.e., an aryl diazonium salt and the solvent dimethyl sulfoxide (DMSO) is presented. The efficient functionalization is attributed to the combination of the solvation of the diazonium cations by DMSO and n-doping of graphene by DMSO, thereby promoting electron transfer (ET) from graphene to the diazonium cations, resulting in the generation of aryl radicals which subsequently react with the graphene. The grafting density of CFG is controlled by the reaction time and very high levels of functionalization, up to the failing of the Tuinstra-Koenig (T-K) relation, while the functionalization layer remains at monolayer height. The grafting ink, effective for days at room temperature, can be used at ambient conditions and renders the patterning CFG by direct writing as easy as writing on paper. In combination with thermal sample treatment, reversible functionalization is possible by subsequent writing/erasing cycles.

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“…[ 21–24 ] Based on diazonium chemistry, the patterned covalent modification (PCF) of GS can be realized through several strategies with different templating methods. These are (1) photolithography‐based masks for templating the chemical‐functionalization of GS, [ 25–27 ] (2) nanopipette scanning lithography to spatially control the chemical‐functionalization of GS, [ 28–30 ] (3) laser scanning lithography to realize the PCF by spatially inducing dediazotization of a diazonium salt on the GS, [ 31 ] (4) nanoparticle lithography as template for the chemical‐functionalization of GS, [ 32–34 ] and (5) molecular lithography as template for the chemical‐functionalization of GS at the molecular scale. [ 35,36 ] In principle, in all of these strategies the chemical‐functionalization of GS has to be templated or controlled spatially via external lithography processes, while a one‐step PCF of GS without any external template or control remains challenging.…”

Section: Introductionmentioning

confidence: 99%

Self‐templated covalent functionalization of graphitic surfaces with a quasi‐periodic pattern

2022

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Patterned covalent functionalization of graphitic surfaces (GSs) is of interest in the development of devices and nanocomposite materials. In contrast to the strategies using external templates or control for realizing patterned covalent functionalization of GSs, here, we present a self-templated strategy by exploiting the synergistic effects of chemical and physical functionalization of GSs. Therefore, a diazonium salt is reduced by potassium iodide (KI) in dimethyl sulfoxide while the solution is in contact with a GS, resulting in its spatially heterogeneous, that is, chemical and physical, functionalization. This heterogeneous functionalization leads to a quasiperiodic pattern of striped corrals with three equivalent orientations in the covalent layer. The formation of the striped corrals is ascribed to physisorbed domains formed by self-assembled N 2 , which is produced in situ during the reduction of the diazonium salt, preventing the covalent functionalization.

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Multicomponent Covalent Chemical Patterning of Graphene

Cited by 38 publications

References 36 publications

2D Janus Transition Metal Dichalcogenides: Properties and Applications

2D Janus Transition Metal Dichalcogenides: Properties and Applications

Grafting Ink for Direct Writing: Solvation Activated Covalent Functionalization of Graphene

Self‐templated covalent functionalization of graphitic surfaces with a quasi‐periodic pattern

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